I've got Schallers on a bunch myself, but generally w/ a strap that has fairly substantial ends w/ holes that aren't too large the Gretsch buttons have caused no issues if I tighten them the half twist or so they've worked themselves loose once every couple hours or so (blue Loctite could help w/ this too). I take the caps off, put the strap on the post & tighten the caps back down when I take the guitars out of the case. Best of both worlds & probably my favorite solution on guitars where they don't look out of place are these: https://www.rockinger.com/en/parts/hardware/strap-pins/455/multi-lock-strapper?c=49 They're Schaller lock compatible when you take off the cap but I pretty much always use a strap w/o locks w/ them. Caps stay in place very well & are easier to grasp than the Gretsch caps. If your strap can work itself past those caps, it might be time for a new strap. Also gives you the free swiveling of the guitar on the strap end of the Schallers w/o the occasional noise coming through your pickups from the metal on metal contact of the lock collar & the button. You might need to drill the stock holes out slightly for the supplied ones to go in smoothly.